Battery and connecting piece thereof

Abstract

The utility model provides a battery and a connecting piece thereof. The connecting sheet is used for being electrically connected to the pole and the roll core and is provided with a first surface and a second surface which are opposite; wherein the first surface is provided with a sinking table groove, the sinking table groove is used for accommodating the pole so that the pole can be welded to the connecting piece through the sinking table groove, and the second surface is provided with an anti-reflection groove corresponding to the sinking table groove. The first surface of the connecting piece is provided with the sinking table groove, so that the thickness of a partial area of the connecting piece is reduced, the maximum thickness of the connecting piece is not changed, and therefore the thickness of the part, needing to be welded through, of the laser on the connecting piece is reduced while the original overcurrent capacity of the connecting piece is guaranteed; meanwhile, reflection of laser on the second surface is reduced by forming the anti-reflection grooves in the second surface, the connecting piece can absorb laser energy easily, and the technical problem that the penetration welding difficulty of the thickened connecting piece is large is comprehensively solved. And the energy cost is saved, the cold solder joint risk is reduced, and the production yield is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery and a connecting sheet thereof. Background Art

[0002] In order to ensure the conduction of the internal and external circuits of the battery, a connecting piece is set inside the battery for transfer connection. The connecting piece connects the pole ear of the winding core inside the battery and the pole outside. Among them, the connecting piece and the pole are usually connected by laser penetration welding. As the demand for fast charging of batteries continues to increase, the requirements for the current capacity of the battery current-carrying components continue to increase, making the thickness of the connecting piece thicker and thicker. However, the increase in the thickness of the connecting piece will increase the difficulty of laser penetration welding, which is easy to cause welding problems. Utility Model Content

[0003] The embodiments of the utility model provide a battery and a connecting piece thereof, which can improve the technical problem that penetration welding of a thickened connecting piece is difficult.

[0004] In a first aspect, an embodiment of the utility model provides a connecting sheet, which is used to electrically connect to a pole and a winding core, and has a first surface and a second surface opposite to each other;

[0005] The first surface is provided with a recessed groove for accommodating the pole so that the pole can be welded to the connecting piece through the recessed groove, and the second surface is provided with an anti-reflection groove corresponding to the recessed groove.

[0006] In one embodiment, the orthographic projection of the recessed platform groove on the second surface covers the orthographic projections of the plurality of anti-reflection grooves on the second surface.

[0007] In one embodiment, the depth of the recessed platform is H, and the thickness of the connecting piece is D, then 0.4 mm ≤ (DH) ≤ 0.6 mm.

[0008] In one embodiment, the connecting piece further has a side surface connected between the first surface and the second surface, and the side surface is provided with an exhaust groove connected to the recessed groove of the sink.

[0009] In one embodiment, the connecting piece further has a side surface connected between the first surface and the second surface, and the recessed platform groove penetrates at least a portion of the side surface in a direction from the first surface to the second surface.

[0010] In one embodiment, an angle between at least a portion of a side wall of at least one of the anti-reflection grooves and a bottom wall of the anti-reflection groove is greater than 90° and less than 180°.

[0011] In the second aspect, an embodiment of the utility model provides a battery, comprising a connecting plate, a pole and a winding core as described above, wherein the pole comprises a main body and a boss connected to one end of the main body, the boss is accommodated in the sinking groove and welded to the connecting plate through the sinking groove.

[0012] In one embodiment, the height of the boss portion is greater than the depth of the countersunk groove so that the boss portion extends out; preferably, the height of the boss portion is M, the depth of the countersunk groove is H, then 0.1mm≤(MH)≤0.3mm.

[0013] In one embodiment, there is a gap between the outer side surface of the boss portion and the side wall of the recessed groove.

[0014] In one embodiment, the second surface is provided with two welding portions welded to the winding core, the two welding portions are arranged opposite to each other about the symmetry axis of the connecting piece, and the sink groove is symmetrically arranged about the symmetry axis of the connecting piece.

[0015] Beneficial effects of the embodiments of the utility model:

[0016] In an embodiment of the utility model, a recessed groove is provided on the first surface of the connecting piece to reduce the thickness of a partial area of ​​the connecting piece without changing the maximum thickness of the connecting piece, thereby achieving the goal of reducing the thickness of the portion of the connecting piece that needs to be welded through by the laser while ensuring the original overcurrent capacity of the connecting piece; at the same time, an anti-reflection groove is provided on the second surface to reduce the reflection of the laser on the second surface, which helps the connecting piece absorb laser energy, thereby comprehensively improving the technical problem of the difficulty of penetration welding of the thickened connecting piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a structural schematic diagram of the first surface of the connecting piece provided in Example 1 of the utility model.

[0019] Figure 2 It is a structural schematic diagram of the first surface of the connecting piece provided in Example 2 of the utility model.

[0020] Figure 3 It is a three-dimensional schematic diagram of the second surface of the connecting sheet provided in Example 1 and Example 2 of the utility model.

[0021] Figure 4 yes Figure 4 An enlarged view of point A in the figure is used to show the structure of an anti-reflection groove.

[0022] Figure 5 yes Figure 4 An enlarged view of point A in the figure is used to show the structure of another anti-reflection groove.

[0023] Figure 6 It is a cross-sectional view of the connecting piece provided in Example 2 of the utility model.

[0024] Figure 7 It is a structural schematic diagram of the first surface of the connecting piece provided in Example 3 of the present utility model.

[0025] Figure 8 It is a schematic diagram of the structure of the pole provided in Example 4 of the utility model.

[0026] Fig. 9 It is a schematic diagram of the assembly of the pole and the connecting piece provided in Example 4 of the utility model.

[0027] Fig.10 It is a cross-sectional view of a pole and a connecting piece provided in Example 4 of the utility model. Description of the drawings:

[0029] 1. Connecting piece; 11. First surface; 111. Sinking groove; 12. Second surface; 121. Anti-reflection groove; 122. Welding part; 13. Side; 131. Exhaust groove; 2. Pole; 21. Main body; 22. Boss part. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0031] Example 1

[0032] Reference Figure 1 and Figure 3, a connecting sheet 1 provided in an embodiment of the present application is used to electrically connect to a pole 2 and a winding core, and has a first surface 11 and a second surface 12 opposite to each other;

[0033] The first surface 11 is provided with a recessed groove 111 for receiving the pole 2 so that the pole 2 can be welded to the connecting piece 1 through the recessed groove 111 . The second surface 12 is provided with a plurality of anti-reflection grooves 121 corresponding to the recessed groove 111 .

[0034] By setting a sink groove 111 on the first surface 11 of the connecting piece 1, the thickness of the connecting piece 1 in a part of the area is reduced without changing the maximum thickness of the connecting piece 1, thereby ensuring the original flow capacity of the connecting piece 1 while reducing the thickness of the part of the connecting piece 1 that the laser needs to weld through; at the same time, by setting an anti-reflection groove 121 on the second surface 12 to reduce the reflection of the laser on the second surface 12, it is beneficial for the connecting piece 1 to absorb the laser energy, and comprehensively improve the technical problem of the difficulty of penetrating welding of the thickened connecting piece 1. It also saves energy costs, reduces the risk of false welding, and improves production yield.

[0035] Example 2

[0036] Reference Figure 2 and Figure 3 The embodiment of the present application provides a connecting sheet 1 having a first surface 11, a second surface 12 and a side surface 13. The first surface 11 and the second surface 12 are arranged opposite to each other, and the side surface 13 is connected between the first surface 11 and the second surface 12.

[0037] The first surface 11 is provided with a recessed groove 111 for accommodating the pole 2, and the bottom of the recessed groove 111 is used for welding with the pole 2. The second surface 12 is provided with a plurality of anti-reflection grooves 121 corresponding to the recessed groove 111. The bottom of the recessed groove 111 is lower than the first surface 11. By setting the recessed groove 111, the thickness of part of the connecting piece 1 is thinned, so as not to change the maximum thickness of the connecting piece 1 and thus maintain the original current capacity, and at the same time reduce the thickness that the laser needs to penetrate to avoid the problem of cold welding. The depth of the recessed groove 111 is H, and the thickness of the connecting piece 1 is D, where D is the thickness between the first surface 11 and the second surface 12, then 0.4mm≤(DH)≤0.6mm. Within the above-mentioned difference range, it is convenient to perform laser penetration welding on the pole 2 and the connecting piece 1, and at the same time ensure that the connecting piece 1 and the pole 2 have a greater connection strength after welding.

[0038] Reference Figure 3 , Figure 4 , Figure 5 and Figure 6, multiple anti-reflection grooves 121 are arranged at equal intervals. The side wall of the anti-reflection groove 121 includes an upper side wall and a lower side wall connected between the upper side wall and the bottom of the anti-reflection groove 121. The angle between the upper side wall and the bottom of the anti-reflection groove 121 is 90°. The angle between the lower side wall and the bottom of the anti-reflection groove 121 is greater than 90° and less than 180°, so that the laser is reflected between the side wall of the anti-reflection groove 121 and the bottom of the anti-reflection groove 121, increasing the contact area between the connecting piece 1 and the laser, improving the problem of high laser reflection in the related art, and further reducing the difficulty of laser penetration welding of the connecting piece 1. The lower side wall can be set to an arc or a plane.

[0039] The depth of the anti-reflection groove 121 is h, 0.1 mm ≤ h < 0.2 mm, so as to better reduce laser reflection, so that there is a certain thickness between the bottom of the anti-reflection groove 121 and the bottom of the sink groove 111 .

[0040] The orthographic projection of the sink groove 111 on the second surface 12 covers the orthographic projection of the plurality of anti-reflection grooves 121 on the second surface 12. Preferably, there is a distance between the orthographic projection of the bottom of the sink groove 111 and the side wall of the sink groove 111 of the plurality of anti-reflection grooves 121. The advantage is that: in the actual production process, it is designed that there may be a gap between the outer side surface of the pole 2 and the side wall of the sink groove 111 to ensure that the sink groove 111 can accommodate the pole 2, so the outer side surface of the pole 2 and the side wall of the sink groove 111 are not necessarily in a fitted state; there is a distance between the orthographic projection of the bottom of the sink groove 111 and the side wall of the sink groove 111 of the plurality of anti-reflection grooves 121, and the plurality of anti-reflection grooves 121 can be used as the reference for laser injection, that is, the coverage range of the anti-reflection groove is the range of laser irradiation welding, ensuring that the bottom of the sink groove 111 is welded to the end of the pole 2, and avoiding the laser welding position between the pole 2 and the side wall of the sink groove 111 as much as possible, thereby reducing the occurrence of false welding.

[0041] Reference Figure 2 The side surface 13 is provided with an exhaust groove 131 connected to the sinking groove 111. During welding, the air in the gap between the outer side surface of the pole 2 and the side wall of the sinking groove 111 expands due to heat and is discharged through the exhaust groove 131, thereby preventing the connection piece 1 from lifting up and thus avoiding the problem of cold welding.

[0042] Example 3

[0043] The difference from Example 2 is:

[0044] Reference Figure 7 The depression groove 111 penetrates at least a portion of the side surface 13 in a direction from the first surface 11 to the second surface 12, thereby increasing the exhaust space for the heated and expanded gas.

[0045] Example 4

[0046] Reference Figure 8 and Fig. 9 The present application provides a battery including the above-mentioned connecting piece 1, pole 2 and winding core. The pole 2 includes a main body 21 and a boss 22 connected to one end of the main body 21. The boss 22 is received in the sinking groove 111 and welded to the connecting piece 1 through the sinking groove 111.

[0047] Reference Fig.10 , the height of the boss portion 22 is greater than the depth of the countersunk groove 111 so that the boss portion 22 extends out, thereby ensuring that the boss portion 22 fits with the countersunk groove 111, thereby achieving welding. Preferably, the height of the boss portion 22 is M, and the depth of the countersunk groove 111 is H, then 0.1mm≤(MH)≤0.3mm. By setting the height difference between the boss portion 22 and the countersunk groove 111 within the above range, while ensuring that the boss portion 22 fits with the countersunk groove 111, the production cost is saved.

[0048] In this embodiment, there is a gap between the outer side surface of the boss portion 22 and the side wall of the countersunk groove 111, and there is a distance between the first surface 11 and the end of the main body 21 facing the boss portion 22, so that the gas expanded by heat during welding can also be discharged through the countersunk groove 111.

[0049] Reference Figure 3 The second surface 12 is provided with two welding parts 122 welded to the winding core, the two welding parts 122 are arranged opposite to each other about the symmetry axis of the connecting piece 1, and the sink groove 111 is symmetrically arranged about the symmetry axis of the connecting piece 1 so that the connecting piece 1 is subjected to uniform force.

[0050] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A connecting sheet (1), characterized in that: It is used for electrically connecting to the pole (2) and the winding core, and has a first surface (11) and a second surface (12) opposite to each other; The first surface (11) is provided with a recessed groove (111), and the recessed groove (111) is used to accommodate the pole (2), so that the pole (2) is welded to the connecting piece (1) through the recessed groove (111), and the second surface (12) is provided with a plurality of anti-reflection grooves (121) corresponding to the recessed groove (111).

2. The connecting piece (1) according to claim 1, characterized in that: The orthographic projection of the depression groove (111) on the second surface (12) covers the orthographic projections of the plurality of anti-reflection grooves (121) on the second surface (12).

3. The connecting piece (1) according to claim 1, characterized in that: The depth of the sink groove (111) is H, and the thickness of the connecting piece (1) is D, then 0.4 mm ≤ (DH) ≤ 0.6 mm.

4. A connecting sheet (1) according to claim 1, characterized in that: The connecting piece (1) further comprises a side surface (13) connected between the first surface (11) and the second surface (12), and the side surface (13) is provided with an exhaust groove (131) communicating with the sink groove (111).

5. The connecting piece (1) according to claim 1, characterized in that: The connecting piece (1) further comprises a side surface (13) connected between the first surface (11) and the second surface (12), and the recessed groove (111) penetrates at least a portion of the side surface (13) in a direction from the first surface (11) to the second surface (12).

6. The connecting sheet (1) according to any one of claims 1 to 5, characterized in that: The angle between at least a portion of the side wall of at least one of the anti-reflection grooves (121) and the bottom wall of the anti-reflection groove (121) is greater than 90° and less than 180°.

7. A battery, comprising a connecting piece (1), a pole (2) and a winding core as claimed in any one of claims 1 to 6, characterized in that: The pole (2) comprises a main body (21) and a boss (22) connected to one end of the main body (21); the boss (22) is received in the sink groove (111) and is welded to the connecting piece (1) through the sink groove (111).

8. The battery according to claim 7, characterized in that The height of the boss portion (22) is greater than the depth of the countersunk groove (111) so that the boss portion (22) protrudes; or, the height of the boss portion (22) is M, and the depth of the countersunk groove (111) is H, then 0.1mm≤(MH)≤0.3mm.

9. The battery according to claim 7, characterized in that There is a gap between the outer side surface of the boss portion (22) and the side wall of the recessed groove (111).

10. The battery according to claim 8, characterized in that The second surface (12) is provided with two welding portions (122) welded to the winding core, the two welding portions (122) are arranged opposite to each other with respect to the symmetry axis of the connecting piece (1), and the sink groove (111) is arranged symmetrically with respect to the symmetry axis of the connecting piece (1).

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